In this paper, the results of micropaleontological research of foraminifer fauna and calcareous nannofossils for upper flysch lithozone in Tikvesh basins, stratigraphically important for determining geological age Paleogene complex in the basin, is presented. Rich and diverse nannofossil flora and microforaminifer fauna found in sediments above flysch lithozone of Krivolak section from Tikvesh Paleogene
basin, gives an option to identify a biostratographic zone according to benthic foraminifera and nannofossil zone
